**Lowell High School Chemistry**

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**Stoichiometry Practice Problems:**

**Practice Problem #1:**

Oxygen gas can be produced by decomposing potassium chlorate using the reaction below. If 138.6 g of KClO_{3} is heated and decomposes completely, what mass of oxygen gas is produced?

KClO_{3} (s) –> KCl (s) + O_{2} (g) [unbalanced]

Answer to Practice Problem #1

**Practice Problem #2:**

Identify the limiting reagent for the given combination of reactants. Calculate how many grams of whatever substance will be in excess and how many grams of HF will be made.

F_{2} (g) + NH_{3} (g) –> N_{2}F_{4} (g) + HF (g) [unbalanced]

5.33 mol 2.22 mol

Answer to Practice Problem #2

**Practice Problem #3:**

How many grams of aluminum sulfate are produced if 23.33 g Al reacts with 74.44 g CuSO_{4}?

Al (s) + CuSO_{4} (aq) –> Al_{2}(SO_{4})_{3} (aq) + Cu (s) [unbalanced]

Answer to Practice Problem #3

**Practice Problem #4:**

Given the following reaction, answer Parts A and B.

NaClO_{3} (s) –> NaCl (s) + O_{2} (g) [unbalanced]

Part A: 12.00 moles of NaClO_{3} will produce how many grams of O_{2}?

Part B: How many grams of NaCl are produced when 80.0 grams of O_{2} are produced?

Answer to Practice Problem #4

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